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J & K CET Engineering J and K - CET Engineering Solved Paper-2008

  • question_answer
    The frequency of fundamental note in an organ pipe is  \[240\text{ }Hz.\] On blowing air, frequencies \[720\text{ }Hz\]and \[1200\text{ }Hz\]are heard. This indicates that organ pipe is

    A)  a pipe closed at one end

    B)  a pipe open at both ends

    C)  closed at both ends

    D)  having holes like flute

    Correct Answer: A

    Solution :

    since,   \[\frac{720}{1200}=\frac{6}{10}=\frac{3}{5},\] ie, \[3:5\] These odd harmonics are produced only if the pipe is closed at one end.


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